<!DOCTYPE html>
<html lang="en" style="overflow: hidden">
<head>
    <meta charset="UTF-8">
    <title>在线聊天</title>
    <script src="https://unpkg.com/vue@2.7.14/dist/vue.min.js"></script>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css"></script>
    <script src="https://unpkg.com/element-ui/lib/index.js"></script>
</head>
<body>
<div id="a" style="height: 100%">
    <header class="p900 flexbtw">
        <h3>在线聊天、在线客服</h3>
        <div>
            欢迎 XXX
            <a href="#">退出</a>
        </div>
    </header>
    <main class="m900 flexbtw" style="height: calc(100% - 75px)">
        <aside>
            <div v-for="id in onlines">{{id}}</div>
        </aside>
        <article>
            <div id="msgs">
                <div v-for=" m in msgs " :class="{recv : m.id!=id, send : m.id==id }">
                    <label class="user">{{m.id}}</label>
                    <span class="msg">{{m.msg}}</span>
                </div>
            </div>
            <textarea placeholder="Ctrl + Center 发送"
                      v-model="msg"></textarea>
            <div id="ops">
                <input placeholder="用户名" v-model="id" :disabled="id&&msgs.length?true:null">
                <button @click.prevent="conn" :disabled="id&&msgs.length?true:null">连接</button>
                <button @click.prevent="send">发送</button>
            </div>
        </article>
    </main>
    <footer>源辰公司</footer>
</div>

<script>
    var v = new Vue({
        el:"#a",
        data:{
            websocket: null,
            id:null,
            msg:"",
            onlines:[],
            msgs:[]
        },
        methods : {
            conn(){
                if( ! this.id ){
                    this.$alert("请输入用户名!");
                    return;
                }
                websocket = new WebSocket("ws://127.0.0.1/toTalk/" + this.id);
                websocket.onopen = (e)=>{
                    console.info("onopen", e);
                }
                websocket.onclose = (e)=>{
                    console.info("onclose", e);
                }
                websocket.onmessage = (e)=>{
                    console.info("onmessage", e);
                    var msg = JSON.parse(e.data);
                    console.info(msg);
                    if(msg.type=='onlined'){
                        // 更新已在人数
                        this.onlines.push(msg.id);
                    } else{
                        this.castMsg(msg);
                        this.msgs.push(msg);
                    }
                }
                websocket.onerror = (e)=>{
                    console.info("onerror", e);
                }
            },
            send(){
                if(this.msg){
                    websocket.send(this.msg);
                    this.msg = "";
                }
            },
            castMsg(msgObj){
                if(msgObj.type=='online'){
                    this.onlines.push(msgObj.id);
                    msgObj.msg = "上线了!";
                } else if(msgObj.type=='downline'){
                    // 过滤掉下线的 id
                    this.onlines = this.onlines.filter(id=>id != msgObj.id);
                    msgObj.msg = "下线了!";
                }
            }
        }
    })
</script>
</body>
</html>



















































<style>
    * {
        padding: 0px;
        margin: 0px;
        font-family: "Arial", "Microsoft YaHei", "黑体", "宋体", sans-serif;
    }

    html,body{
        height: 100%;
    }
    body{
        display: flex;
        flex-direction: column;
    }

    a {
        text-decoration: none;
    }

    button{
        padding: 3px 10px;
    }

    .p900 {
        padding: 0px calc((100% - 900px) / 2);
    }

    .m900 {
        width: 900px;
        margin: 0px auto;
    }

    .flexbtw {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    header {
        background-color: #eee;
        flex: none;
    }
    header>h3{
        margin: 10px 0px;
    }

    main {
        flex: auto;
        background-color: #ddd;
    }

    footer {
        flex: none;
        padding: 5px;
        text-align: center;
        background-color: #eee;
    }

    aside {
        width: 200px;
        height: 100%;
        background-color: #ccc;
        flex: none;
    }

    article {
        height: 100%;
        flex: auto;
    }

    article {
        display: flex;
        flex-direction: column;
    }

    #msgs {
        flex: auto;
        box-sizing: border-box;
        padding: 10px;
    }

    #msg {
        flex: none;
        width: 100%;
        height: 100px;
        box-sizing: border-box;
    }

    .send > * {
        float: right;
    }

    .recv > * {
        float: left;
    }

    .send, .recv {
        clear: both;
        padding: 5px 0px;
    }

    .user, .msg {
        padding: 5px;
    }

    .msg {
        background-color: #e9e9e9;
        border-radius: 3px;
    }

    aside>div{
        text-align: center;
        padding: 10px;
        margin: 3px;
        background-color:#8c939d;
    }

    aside>div:hover{
        background-color:#8c939d55;
        cursor: pointer;
    }

    #ops{
        text-align: right;
        padding: 7px;
    }
    #ops>*{
        box-sizing: border-box;
        height: 25px;
        vertical-align: middle;
        margin: 0px 5px;
        text-align: center;
    }
    textarea{
        padding: 3px;
    }
</style>